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HP: Creating logical volumes
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:Title:        HP: Creating logical volumes
:Author:       Douglas O'Leary <dkoleary@olearycomputers.com>
:Description:  HP: Creating logical volumes
:Date created: 05/2005
:Date updated: 06/2006
:Disclaimer:   Standard: Use the information that follows at your own risk.  If you screw up a system, don't blame it on me...

Logical volumes can be used either for filesystems or for RDBMS raw 
partitions. Either way, the procedure for creating them are the same:

*  Create a volume group which will hold the logical volume. Please see 
   :doc:`HP: Creating Volume Groups <hp_vgcreate>`

*  Determine how to place the LV on the VG's disks.

   *  Default - LVM will handle the LV placement::

         lvcreate -L ${Size-megs} ${vg}

   *  Manual - Sysadmin determines where LV goes.

      *  Set an array of disks on which the LV will reside::

            set -A disks $(list_o_disks)

      *  Create the logical volume definition::

            lvcreate -i ${stripe_width} -I ${stripe_size} \
            -n ${lvol_name} ${vg}

      *  Expand the LV to the appropriate size::

            lvextend -L ${Size-megs} ${lv} ${disks[*]}

*  If appropriate, create a filesytem. Please see 
   :doc:`Creating Filesystems <hp_newfs>` for details.